This paper presents the development of a hydraulic fracture simulator called StimFrac® based on a pseudo-tridimensional geometry fracture propagation (P3D) model. The model represents a compromise solution between 2D and 3D models in terms of accuracy and computational effort. The P3D model establishes a fracture with elliptic transversal sections, as the 2D models, but with variable height, providing a geometry for the fracture similar to those provided by the 3D models but a significantly lower computational cost. The developed simulator solves the coupled problem of fluid flow and elactic deformation associated with a vertical fracture propagation hydraulically induced inside a formation (homogeneous and isotropic) with three layers (a productive zone bounded by two adjacent layers) with different in-situ stresses. Furthermore, StimFrac® have models for: the behavior (suspension and deposition) of the propant within the fluid, the post-fracture flowing bottom hole pressure and, t...

CO2 Capture & Storage (CCS) in saline aquifer is one of the most promising technologies for reducing anthropogenic emission of CO2. Feasibility studies for CO2 geo-sequestration in Italy have increased in the last few years. Before planning a CCS plant an appropriate precision and accuracy in the prediction of the reservoir evolution during injection, in terms of both geochemical calculation and fluid flow properties, is demanded. In this work a geochemical model will be presented for an offshore well in the Tyrrhenian Sea where the injection of 1.5 million ton/ year of CO2 is planned. The dimension of the trapping structure requires to study an area of about 100 km and 4 km deep. Consequently, three different simulations were performed by means of TOUGHREACT code with Equation Of State module ECO2N. The first simulation is a stratigraphic column with a size of 110*110*4,000 meters and a metric resolution in the injection/cap-rock area (total of 8,470 elements), performed in order t...

Este ensaio apresenta as principais politicas de acoes afirmativas que permeiam a gestao da universidade publica no Brasil atualmente. Nos ancoramos principalmente no texto de Boaventura de Sousa Santos intitulado “A universidade no seculo XXI: para uma reforma democratica e emancipatoria da universidade” (2007), cujo autor nos chama a atencao sobre a responsabilidade das universidades que devem levar em conta o seu papel social e como produtora de conhecimento cientifico: o acesso; a extensao; a ecologia de saberes, a pesquisa-acao e a relacao universidade/escola publica. O presente trabalho tambem discute outras acoes afirmativas e as politicas de cotas instituidas pelo governo federal a partir de 2000, procurando apresentar um breve panorama atual da Universidade Brasileira quanto ao acesso e permanencia e sua repercussao social no Seculo XXI. Palavras-chave: Boaventura de Sousa Santos. Universidade Publica. Acoes Afirmativas.